Holly: Boron deficiency Categories: Holly Holly Diseases Ornamentals Shrubs Last review date: 2026-05-25 11:36 Last edit date: Necrotic spotting on leaves from boron deficiency Photo by: R.S. Byther Biology Boron deficiency in holly is characterized by the appearance of spots on the leaves. The spots initially are red to purple and irregularly shaped on the […]
Holly: Green algae Categories: Holly Holly Diseases Ornamentals Shrubs Last review date: 2026-05-25 01:04 Last edit date: Green algae on holly Photo by: B.M. Johnson Biology Green algae grows on the surface only of leaves, twigs, and trunks. Wet, humid weather favors development of these microscopic, moisture-loving, primitive plants. The colonized holly is not harmed […]
Holly: Phytophthora leaf & twig blight Categories: Holly Holly Diseases Ornamentals Shrubs Last review date: 2026-08-28 02:15 Last edit date: Holly Phytophthora leaf and twig blight Photo by: J.W. Pscheidt Biology Leaf and twig blight of holly is caused by a different Phytophthora species than is associated with root rots. Symptoms first appear in the […]
Holly: Red leaf spotting Categories: Holly Holly Diseases Ornamentals Shrubs Last review date: 2026-05-25 02:15 Last edit date: Holly red leaf spotting Photo by: J.W. Pscheidt Biology Red leaf spotting of holly is a general category which includes physical or pesticide damage, nutritional deficiency, and disease symptoms. Damage from the holly’s own spines can cause […]